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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6360fd8f1e6f7ec5fcccae1ffdfad45cc4ae9c073c07e70e831d99730aaf5c71' 
  AND token = 'BpotQd48U4pHYkJpiHEmyHomiRRi49QIb0Zb8Hg9h24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}